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Imax B6 Charger: Charging MaxPower and Vipow 12V 7Ah Gel Batteries - Voltage Parameters

procsa 13467 11
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  • #1 16742218
    procsa
    Level 31  
    Hello, I read a lot of topics on the forum about gel batteries and their charging, I came across conflicting information that imax B6 modeling chargers can be used to charge gel batteries and not ...
    Such chargers have the Pb setting (program), you can choose, for example, "6p 12V", but the max charging voltage is 14.7V and the discharge voltage is 9V.
    From the topics that I read, you can deduce differently about the charging voltage, some write 13.8V, others 14.4V or even 15V. As for the discharge voltage, it is 10.5V in total, although someone wrote 11.1V.

    I have typical gel batteries, MaxPower and Vipow 12V 7Ah brands, on their housings there is a note: Standby mode - 13.6-13.8V, cyclic operation 14.5-14.9V

    Can I easily connect such batteries to charging with the imax B6 charger, which has the Pb program with the above-mentioned parameters, and leave them for a few / several hours, without fear for their "health"?
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  • Helpful post
    #2 16742264
    Wlodek22
    Level 31  
    procsa wrote:
    I have typical gel batteries, MaxPower and Vipow 12V 7Ah brands, on their housings there is a note: Standby mode - 13.6-13.8V, cyclic operation 14.5-14.9V
    These are typical AGM batteries, not gel ones, and you can safely land them with 14.7V.
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  • #3 16742386
    procsa
    Level 31  
    In fact, my mistake, they are AGM batteries there is no gel in them ... The charger, after exceeding 14.4V, reduces the current, so probably everything is ok. What about the discharge voltage?
  • Helpful post
    #4 16742399
    Wlodek22
    Level 31  
    Good question.
    These batteries are designed for buffer operation and deep discharge sulphates them very much, so the less the better. Try not to discharge below 11.5V, then recharge as soon as possible.
  • #5 18607545
    cool_wicia
    Level 3  
    I have an IMAX b6 and I'm loading it with a 12ah gel battery. The charger detects that a voltage of 14.7 is over. After about 10 hours, I got 14.7 and 2800 mAh came in, the landing current dropped to 0.3 And after another 2 hours, the 3100 man flies slowly on. That is, already unplug or wait until the counter ah will not move ???

    Added after 4 [hours] 31 [minutes]:

    Now it is 1:00 p.m. and 4100 has already entered, the tension is still 14.7
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  • #6 18608415
    Wawrzyniec
    Level 38  
    It will save and stop loading.
  • #7 18608431
    cool_wicia
    Level 3  
    For this rehearsal, I only loaded the lipo and everything was smacking.
    Now I decided to charge a normal small battery, it seems to me that it is better to charge like a regular power supply that joined the car.
  • #8 18608511
    Wawrzyniec
    Level 38  
    I used this for a 55Ah car battery. He gives advice easily. And you load in CC CV mode
  • #9 18643860
    cool_wicia
    Level 3  
    Loads with Pb program
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  • #10 18644140
    Wawrzyniec
    Level 38  
    This is the correct program. First, it charges with a fixed current, then stabilizes the voltage and the current decreases. When charging is complete, it will beep and show how much Ah has been loaded into the battery.
  • #11 18653869
    leonnn87
    Level 7  
    Wlodek22 wrote:
    procsa wrote:
    I have typical gel batteries, MaxPower and Vipow 12V 7Ah brands, on their housings there is a note: Standby mode - 13.6-13.8V, cyclic operation 14.5-14.9V
    These are typical AGM batteries, not gel ones, and you can safely land them with 14.7V.

    Exactly, they're not gels, although most people don't talk about them like that, but technically it's AGM. And a lot depends on charging: www.akumulatoryzelowe.pl/faq/ladowarka-akumulatora-zelowego.php, it is worth not to spoil the equipment or shorten its life if you wish.
  • #12 18655352
    Wawrzyniec
    Level 38  
    leonnn87 wrote:
    And a lot depends on charging: www.akumulatoryzelowe.pl/faq/ladowarka-akumulatora-zelowego.php, it is worth not to spoil the equipment or shorten its life if you wish.
    I do not understand why this link, nothing German there. These are just a very general outline of chargers for gel batteries in which imax B6 fits most. It is true that it does not automatically resume charging after a power failure, but, for example, it has temperature control (after purchasing accessories).
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Topic summary

✨ The discussion centers around the use of the IMAX B6 charger for charging MaxPower and Vipow 12V 7Ah batteries, which are identified as AGM batteries rather than gel batteries. Users clarify that the IMAX B6 charger can safely charge these batteries using the Pb program, with a maximum charging voltage of 14.7V. It is advised to avoid discharging the batteries below 11.5V to prevent sulfation. The charger operates in a constant current/constant voltage (CC/CV) mode, reducing current as the battery approaches full charge. Users share their experiences with charging times and current readings, confirming that the charger will stop charging automatically when complete.
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FAQ

TL;DR: Use the Imax B6 “Pb 12V” program to charge these 12V 7Ah AGM batteries at up to 14.7 V; as one expert put it, “you can safely [charge] with 14.7V.” [Elektroda, Wlodek22, post #16742264]

Why it matters: This FAQ helps hobbyists avoid undercharging, overdischarging, and premature sulfation when using RC chargers on small AGM batteries.

Quick Facts

Can I charge MaxPower/Vipow 12V 7Ah with an Imax B6?

Yes. Treat them as 12V AGM under the B6’s Pb program. An expert clarified these are AGM, not gel, and stated they’re safe at 14.7 V. Select “Pb 12V,” confirm polarity, and monitor temperature if you have the probe. “You can safely charge with 14.7V.” [Elektroda, Wlodek22, post #16742264]

What voltage should I set for charging?

Follow the battery label’s cyclic window: 14.5–14.9 V. The B6 Pb mode peaks at about 14.7 V, which sits inside that range. This aligns with the case print: standby 13.6–13.8 V and cyclic 14.5–14.9 V. Use cyclic voltage for active charging and switch to float when storing. [Elektroda, procsa, post #16742218]

What discharge cutoff voltage should I use for these AGM batteries?

Avoid discharging below 11.5 V. Deeper discharge accelerates sulfation and shortens life. Recharge as soon as you reach that threshold. This is stricter than 10.5 V “dead” thresholds often quoted for lead‑acid, but it preserves capacity and cycle count for small standby‑type AGM batteries. [Elektroda, Wlodek22, post #16742399]

How does the Imax B6 Pb program actually charge lead‑acid?

It uses a two‑stage profile: constant current (CC) to the target voltage, then constant voltage (CV) while current tapers. The charger ends with an audible beep and displays amp‑hours charged. This behavior suits small AGM batteries and makes capacity tracking easy. [Elektroda, Wawrzyniec, post #18644140]

Is it okay to leave the battery on the B6 for a few hours?

Yes, during a normal session. The B6 will taper current at about 14.7 V and stop the cycle with a beep. Users reported long top‑off periods with slow Ah accumulation while voltage holds at 14.7 V. Unplug after completion to avoid unnecessary float on the B6. [Elektroda, cool_wicia, post #18607545]

What float/standby voltage should I target for storage?

Use 13.6–13.8 V for standby/float. That value is printed on the battery housing and matches standard AGM float guidance. Float maintains charge without excessive gassing or water loss in sealed units. Store cool and recharge after any use. [Elektroda, procsa, post #16742218]

Can the Imax B6 handle larger lead‑acid batteries?

Yes, within its current limits. A user successfully charged a 55Ah car battery using the B6. Set Pb mode and observe CC/CV behavior. Charging large capacities will be slow but feasible if current and power limits are respected. [Elektroda, Wawrzyniec, post #18608511]

What should I watch out for during discharge cycles?

Do not deep‑discharge. Keep above 11.5 V and recharge promptly. Repeated deep discharge leads to sulfation, reduced capacity, and early failure. This is critical for standby‑type AGM blocks used in UPS or alarm systems. [Elektroda, Wlodek22, post #16742399]

Does the Imax B6 resume automatically after a power outage?

No. It does not auto‑resume after a power failure. Restart the program manually when power returns. Consider this when charging unattended or on unstable mains to avoid incomplete cycles. [Elektroda, Wawrzyniec, post #18655352]

What is AGM and how is it different from gel?

AGM uses Absorbent Glass Mat separators to hold electrolyte; gel uses silica‑gelled electrolyte. The discussed MaxPower/Vipow 7Ah units are AGM, not gel, so use AGM‑appropriate voltages like 14.7 V in cyclic mode. Labeling confusion is common in retail listings. [Elektroda, Wlodek22, post #16742264]

What is CC/CV in lead‑acid charging?

CC/CV means constant current followed by constant voltage. The B6 charges at a set current until the battery reaches the target voltage, then holds voltage while current tapers to termination. “First, it charges with a fixed current, then stabilizes the voltage.” [Elektroda, Wawrzyniec, post #18644140]

How long will top‑off take near 14.7 V?

It can take hours with small tapering currents. One log showed current dropping to about 0.3 A while Ah slowly climbed from 2.8 Ah to roughly 4.1 Ah at 14.7 V. This slow finish indicates absorption completing. [Elektroda, cool_wicia, post #18607545]

Is 10.5 V a safe cutoff for these small AGM batteries?

No. 10.5 V is a “dead flat” benchmark, not a healthy cutoff. For long life, stop around 11.5 V and recharge immediately. Deeper discharge increases sulfation and reduces cycle count markedly. [Elektroda, Wlodek22, post #16742399]

How do I set up Imax B6 to charge a 12V 7Ah AGM safely?

  1. Select Pb program and choose 12V.
  2. Set charge current to about 0.5–1.0 A for gentle charging.
  3. Start; let it run CC→CV to 14.7 V until it beeps and shows Ah. [Elektroda, Wawrzyniec, post #18644140]

Do I need temperature monitoring with the B6?

It’s optional but helpful. The B6 supports a temperature probe accessory. Use it if charging in warm environments or enclosed spaces to add protection and stop on over‑temp events. [Elektroda, Wawrzyniec, post #18655352]
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